1st api :
https://api.atlassian.com/ex/confluence/{cloudId}/rest/api/content/{pageId}/child/attachment
received download endpoint in response
Tried calling it using access token and oauth2.0 sysntax and received 401
https://api.atlassian.com/ex/confluence/{cloudid}/download/attachments/{pageid}/Screen%20Shot%202019-10-11%20at%203.19.28%20PM.png?version=1&modificationDate=1570787674135&cacheVersion=1&api=v2
401 means you are not authorised, so you've either given it the wrong credentials or you're not calling the authorisation system correctly.
I am able to get response for other APIs with these steps and access token
problem is only while downloading attachments using oauth 2.0
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